Paint or varnish and method of making the same.



of the principal dlfliculties is,

UNITED sTATEs PATENT o EIoE.

FREDERICK W. SPERR, JR., OF OAKMONT, AND MARC DARRIN, OF WILKINSBURG,

PENNSYLVANIA, ASSIGNORS TO H. KOPPERS COMPANY, OF PITTSBURGH, PENN- SYLVANIA, A CORPORATION OF PENNSYLVANIA.

PAINT OR VABNISH AND METHOD OF MAKING THE SAME.

1,292,907. No Drawing.

To all whom it may concern:

Be it known that we, FREDERICK. W. SPERR, Jr., and MARC DARRIN, both citizens of the United States, and'residents of Oakmont and Wilkinsburg, respectively, both in the county of Allegheny and State of Pen sylvania, have invented a new and useful Paint or Varnish and Method of Making the Same, of which the following is a full, clear, and exact description.

This invention relates toa new composition of matter having bituminous pitch as one of its principal constituents and suitable for use as a paint or varnish; and also to a novel method of preparing such composition.

Our invention provides a composition which overcomes a number of objections that have hitherto applied to the use of bituaints-or varnishes. One

that of holding the pitch completely in solution in the solvent. Usually there is a strong tendency especially in the case of pitches high in free carbon, for part of the pitch to precipitate out when the mixture is allowed to stand. Coal tar pitch is an example of a bituminous pitch that is often used in paints and varnishes. The solvents ordinarily employed to hold this insolution are the coal tar creosote oils; but these are acidic in nature, slow non-resistant chemically, and but poorly resistant to weathering. These qualities are due to the fact that coal tar creosote oils are composed-to a large extent of cresols and other. compounds, closely related chemically'to carboli'c acid.. Such compounds are not only easily saponified by alkalis, but are also soluble in water to an a preciable extent. Thus, the oil is gradua ly leached out of the paint film, leaving a brittle, crumbling layer, which is neither protective nor ornaminous pitches in mental.

We have found that the employment of a compound of the coumaronendene group in combination with a suitable solvent, greatly facilitates holding the pitch in solution, and

the mixturewhen properly made-is of neutral character, possesses good drying properties, and hasexcellent resistance to Weathering and chemical action.

The method that we have found best adapted to making compositions of this Specification of Letters Patent. I

Patented Jan. 28, 1919;

Application filed August 10, 1817. Serial No. 185,487.

character, consists in heating a quantity of pitch to approximately 160 C., at which temperature it is very fluid, allowing the pitch to cool to a temperature of 140 C.or

thereabout, and then addin a suitable vola- I lent paint by use of the following proportions: seven hundred ounds of medium grade coal tar pitch, with fifty-five gallons of solvent naphtha, containing approxi- .mately. forty per cent. coumarone-indene bodies by weight.

The compounds such as coumarone, O H O, and indene, C,H,, may be used either directly as such, or they may be first polymerized to products such as aracoumarone, (C,H,O) paraind'ene, ,H and related substances. The use of these polymerized compounds is of special advantage in producing hard resistant coatings. In some cases the process of polymerizationmay be advantageously combined with the solution of the pitch, or else it may be efi'ected to the desired extent after the solution has been ac,-

complished. For instance, we may take solvents containing coumarone Or indene, and mix them with pitch heated to approximately 160 (1., and polymerize the coumarone or indene in the mixture by blowing steam or air through it, holding the solvent by means of a reflux condenser. Or we may efi'ect the polymerization withimthe mixture by means of a suitable catalyzer, such as aluminum chlorid.. Therefor in the claims wh ch define the process of making the composition, we do not intend, unless so specifically stated in the claims, to limit the claims to any particular sequence in the occurrence of the step of polymerizing the compounds of the coumarone-indene group, because as above pointed out the step of polymerizing these compounds may occur previous to, simultaneously with, or subsequent to the step of mixing the coal tar pitch and the solvent containing these compounds.

Other materials such as turpentine, linseed oil, china wood oil,'Veneti an Red, red lead, zinc oleate, manganese res nate, barium sulfate, etc., may be mixed w1th the herein described composition for use as thinners, driers, fillers, etc., without afi'ectmg the intent and purpose of this invention.

We do not limit ourselves to the particular proportions above stated, as these may be varied to a considerable extent within the sco e of the appended claims.

e claim:

1. A paint or varnish comprising a bitu-.

minous pitch, a volatile solvent, and compounds of the coumarone-indene group.

2. A paint or varnish comprising a bituminous pitch, asolvent naphtha, and compounds of the coumarone-indene group.

3. A paint or varnish comprising a coal tar pitch, a volatile solvent, .and' compounds of the coumarone-indene group.

4. A paint-or varnish comprising coal tar.

pitch, solvent naphtha, and compounds of the coumarone-indene group.

A paint or varnish comprising a bituminous pitch, a volatile solvent, and polyminous pitch, solvent naphtha, and polymerization products of the coumarone-indene group.

6. A paint or varnish comprising a'bitumerization products of the coumarone-ining compounds of the coumarone-indene dene group.

v 7. .A p aint or varnish comprising a coal tar pitch, a volatile solvent, and polymerization products of the coumarone-indene group.

8. A paint or varnishcomprising a coal "tar pitch, solvent naphtha, and polymerization products of the coumarone-indene group.

9. The process of making a composition.

suitable for. use as a paint or varnish, con-. sisting in heating a bituminous pitch, and mixing therewith a solvent containing compounds of the coumarone-indene group, and

polymerizing these compounds.

10. The process of making a composition suitable for use asa paint or varnish, con sisting in heating a bituminous pitch and mixing therewith solvent naphtha containgroup and polymerizing these compounds.

11. The process of making a composition suitable for use as a paint or varnish, consisting in heating a coal tar pitch and mix,- ing therewith a solvent containing compounds of' thecoumarone-indene group and polymerizing these compounds.

12. The process of making a composition suitable for use as a paint or varnish consisting in heating a coal tar pitch and a solvent containing compounds or" the-coumarone-indene group and polymerizing these compounds. t i

13. The process of making a composition suitable for use as a paint or varnish, concontaining compounds of the coumarone-inpitch andheavy naphtha.

aaeaaov sisting in heating a bituminous pitch, and

mixing therewith a solvent containing compounds of the coumarone-ind'ene grou and polymerizing these compounds simu taneously. v

1.4. The process of making a composition -suitable for use as a paint or varnish, condene group and polymerizing' these compounds simultaneously.v I

17. -A coating composition containing a polymerized coumarone, a pitch and a solvent.

18. A coating composition containing 90 coumarone resin, a pitch and a solvent.

19. A coating composition containing a polymerized coumarone, a 'high melting pitch and a solvent.

20. Acoatingcompbsition containing coumarone resin, a high vmelting pitch and a solvent.

21. A coating composition containing a polymerized coumarone, coal tar pitch and a solvent.-

23. A coating composition containing a polymerized coumarone, a pitch and heavy naphtha. a

24. A coating composition containing coumarone resin, a pitch and heavy naphtha. 1 25. A'coating composition containing a polymerized coumarone, a high melting 26. A coating composition containing coumarone resin, a high melting pitch and,

heavy naphtha.

27. A coating. composition containing. a polymerized coumarone, coaltar pitch and eavynaphtha.

28. A coating composition containing coumarone resin, coal tar pitch and heavy naphtha. v In testimony whereof, we havehereunto set our hands.

FREDERICK W. .SPERR, JR.

MARC DARRIN.

I00 22. A coating composition containing coumarone resin, coal tar pitch and a solvent. 

